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walreceiver uses a temporary replication slot by default

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If no permanent replication slot is configured using
primary_slot_name, the walreceiver now creates and uses a temporary
replication slot.  A new setting wal_receiver_create_temp_slot can be
used to disable this behavior, for example, if the remote instance is
out of replication slots.

Reviewed-by: Masahiko Sawada <masahiko.sawada@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/CA%2Bfd4k4dM0iEPLxyVyme2RAFsn8SUgrNtBJOu81YqTY4V%2BnqZA%40mail.gmail.com
This commit is contained in:
Peter Eisentraut
2020-01-14 14:07:11 +01:00
parent ee4ac46c8e
commit 3297308278
6 changed files with 82 additions and 0 deletions
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9
src/backend/utils/misc/guc.c
View File

@@ -1969,6 +1969,15 @@ static struct config_bool ConfigureNamesBool[] =
NULL, NULL, NULL
},
{
{"wal_receiver_create_temp_slot", PGC_SIGHUP, REPLICATION_STANDBY,
gettext_noop("Sets whether a WAL receiver should create a temporary replication slot if no permanent slot is configured."),
},
&wal_receiver_create_temp_slot,
true,
NULL, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL

1
src/backend/utils/misc/postgresql.conf.sample
View File

@@ -321,6 +321,7 @@
#max_standby_streaming_delay = 30s # max delay before canceling queries
# when reading streaming WAL;
# -1 allows indefinite delay
#wal_receiver_create_temp_slot = on # create temp slot if primary_slot_name not set
#wal_receiver_status_interval = 10s # send replies at least this often
# 0 disables
#hot_standby_feedback = off # send info from standby to prevent